A DESCRIPTION OF THE PROBLEM :
My java web application is based on SpringBoot and running on JDK1.8.0_181-b13, and some day it crashed.
The following is what I has done but not worked well:
1.change jvm args, using "-XX:-TieredCompilation", this reduce the number of crashes
2.expand heap space, this has no effect and crash still occurred
3.upgrade to JDK1.8.0_201, not worked well...

Almost all of the crash files are like this(crash_file1):
https://gist.github.com/bug1024/dae9b183c244fc90ab1cf34493724d3c

This kind of crash file only occurred twice(crash_file2):
https://gist.github.com/bug1024/9e4db26c4798b1935b2cf2668c7b9287

Application will be restart after crash, the following is the application log:
https://gist.github.com/bug1024/8b4c034d04dd23f8afbac4da4d6f45e7

I found an incredible NullPointerException In application log, on line 329 "return null" cause NPE?
https://gist.github.com/bug1024/1752b203b4760a71bf12ca5683548e1f

Unfortunately, I can not reproduce this crash ...




FREQUENCY : occasionally